Adjustable electric-lamp holder.



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PATENTED OCT. 10, 1905.

H. F. HOLTMANN.

ADJUSTABLE ELECTRIC LAMP HOLDER! APPLICATION FILED NOV 23 1904 muaewv a mu co. vnmmumocmrnnu. wnmnorun. n. a

UNITE STATES PATENT OFFICE.

ADJUSTABLE ELECTRIC-LAMP HOLDER.

No. 801,66e.

Specification of Letters Patent.

Patented Oct. 10, 1905.

A li ati filed November 23,1904- Serial No. 233,945.

To all 1071,0111 it may concern.-

Be it known that I, HENRY F. HOLTMANN, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented new and useful Improvements in Adjustable Electric-Lamp Holders and I do declare the following to be a full, clear, and exact description of the invention, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

The invention relates to the class of holders that are designed to be attached to walls and ceilings and to posts in workshops and other places where incandescent electric lamps may be used, the invention having referenee particularly to holders whereby such lamps that are connected to han ing wires may be guided and held adjustabdy in convenient positions near to the workmen and their work.

The objects of the invention are to provide electric-lamp holders which may be cheaply constructed, readily set in place for use, quickly adjusted when desired, and which may hold the lamps suspended non-rigidly in various posit-ions, so that they will not be liable to be broken when accidentally collided with by workmen or by various tools or implements and so that the insulation of the circuit-wires will not be ruptured or damaged.

With the aboven1entioned and other objects in view the invention consists of an improved extensible holder having novel forms of universal and other friction joints or couplings and novel means for supporting the lamp and for holding up the slack in the circuit-wires; and the invention consists, further, in the parts and the combination and arrangement of parts, as hereinafter particularly described and claimed.

Referring to the drawings, Figure 1 is a view of the holder shown as when hanging from a ceiling; Fig. 2, a side view of the holder shown as when supported by a vertical wall or post; Fig. 3, a perspective view of the friction-head of the universal joint of the holder-arm; Fig. 4, a longitudinal central sectional view of the holder in which portions of the supporting parts are broken away; Fig. 5, transverse sectional view taken as at the line 1 l in Fig. 2; Fig. 6, a fragmentary longitudinal central sectional view of the main part of the holder-arm; Fig. 7, a

fragmentary external view of the extension part of the arm; Fig. 8, a perspective view of the circuit-wire guide and holder, and Figs. 9 and 10 are perspective views of the two friction-blades of the holder-arm jaw.

Similar reference characters in the drawings designate corresponding parts or features.

In construction a base A, preferably of wood, is provided that is adapted to be secured to a ceiling or a wall or to a block a or Z), to which the circuit-wires are usually an chored by means of insulators. A spring blade B has a foot 0, which is secured to the base A, and a spring-blade B has a foot (1, which is also secured to the base A, the two blades being oppositely disposed and together forming a springjaw in which is pivoted a friction-head C, having two pivotal holes 6 and f, whose axes are at right angles one to the other. About each end of each hole in the head C is a circular de ression, as g and g, so that the contacts of t 1e blades with the head are at a little distance from the holes. The pivotal connection is made by means of a pivot-bolt D, extending through the pivothole in one end of the head and suitable holes in the aw-blades and suitably secured against turning in the blades, the bolt having a head D at one end and provided at its 0 posite end with a friction adjusting-nut E, caring against the adjacent blade, so that the heat is pivoted and held. frictionally between the two blades B and B, and will remain at any position to which it may be adjusted pivotally. In the pivot-hole in the opposite end of the head C is a pivot-bolt F, havlng a head F and an adjusting-nut G, pivotally connecting two spring-blades H and H thereto, the blades bearing against the head about the recesses that extend about the pivot-hole therein. The bolt F is prevented from turning in the jaw-blades by means of a square part it thereof seated in the blade H. The blade 11 has a square bolt-hole i and the blade H a circular bolt-hole j to receive the pivot-bolt F, and the blades have shanks 7c and k, which together form a socket in which the main part I of the holder-arm is secured rigidly by a rivet 2, so that the arm may move radially on the pivots D and F to any degree of angularity within ninety degrees to the lane of the support of the arm. The part I lS l1OllO\\', as a tube, and has a contracted end Z, forming an extended frictionbearing and an internal stop shoulder m.

In the part I is an extension art J, that is also hollow or tubular and a apted to slide endwise therein, the part fitting closely in the end Z and having at its inner end a slit n in an enlarged part 1), which frictionally engages the part the enlarged part having a shoulder 9, adapted to engage the shoulder m. An ornament K is secured, by means of a shank 12 thereof, to the end of the arm part J.

The circuit-wire guide and su port, which connects the lamp to the end of the holderarm, comprises a rod L, that extends parallel to the holderarm and which is provided at one end thereof with a collar 8, that slides on the arm part I, the rod being also provided with a flexible loop 25 near the collar and a loop 11, at the opposite end thereof, which is also flexible, and a rojection 1), that is attached to the rod near t e loop u, extends through the end of the part J and also through the shank r and is secured thereto, so that the rod moves outside of the holderarm in unison with the part J of the arm. The two circuit-wires being insulated in a cable to, the lamp a; is connected thereto in the usual manner, the cable extending through the loops t and u and the lamp being suspended by the cable and free to swing about the loop to. The loops are pressed and closed against the cable, so that the latter may be held against sli ping through the loops, a portion of the cable between its wallfastenings and the loop 25 being slack when the part J is entirely within the part I of the arm-that is, when the arm is contracted. The rod L is sufficiently long to hold the ca ble near the lamp out of the way of the workmen. The collar 8, the loops t and u, and the projection 42 are all integral with the rod L,

ut may be otherwise formed.

In practical use when the holder is supported overhead, as by a ceiling, the arm may be moved about, as indicated by broken lines in Fig. 1, so as to carry the lamp ac to the desired position, the lamp being suspended so as to swing freely at the end of the cable w. When the holder is supported by a wall or other vertical object, the arm may extend horizontally upwardly or laterally, or it may be drawn downwardly, as indicated in broken lines in Fig. 2, to various degrees, thelamp being suspended at the end of the cable. When desired,-the arm may be either lengthened or shortened by moving the part J thereof endwise relatively to the main part I, the portion of the cable w between the loops t and to being at all times kept straight close to the arm.

Having thus described the invention, what is claimed as new is 1. An extensible electric-lamp holder comprising a main arm part, an extensible arm part mounted slidingly in the main arm part,

and cable-holders comprising a rod provided at one end thereof with a collar extending slidingly about the main arm part and also with a loop extending oppositely from the collar, the rod being also provided at the opposite end thereof wit-ha flexible loop and also with a projection that is secured to the outer end of the extensible arm part, anda circuit-Wire cable extending through the loops of the rod and secured in the flexible loop thereof.

2. An extensible electric-lamp holder comprising a main arm part, an extensible arm part mounted slidingly in the main arm part and having a transverse aperture in the outer end thereof, a rod twisted at one end thereof in the form of a loop and also a projection, the

projection extending through and secured in the transverse aperture of said extensible arm part, said rod being also provided at its opposite end with a collar extending movably about said main arm part and with a loop extending oppositely to the collar thereof, and a circuit-Wire cable extending through said loops.

3. An adjustable electric-lamp holder comprising a base, a pair of spring jaw-blades having each a foot secured to the base, a friction-head pivoted between the jawblades and having depressions in opposite sides thereof extending about the pivot thereof adjacent to the jaw-blades, said pivot-head having a pivot-bolt therein and recesses in opposite sides thereof extending about the pivot-bolt thereof, a pair of spring j aw-blades mounted on the pivotbolt of the head and having shanks that are concavoconvex transversely together forming a socket, a main holderarm part secured in said socket, an extensible arm part movable in said main arm part, a flexible loop attached to the end of the extensible arm part, a collar movable on said main arm part and provided with a flexible loop, a rod attached to both of said loops, and a circuit-wire cable extending through said loops.

4. In an adjustable electric-lamp holder, the combination with a hollow main holderarm part, and an extensible arm part slidingly arranged in the main arm part, of a rod secured to the extensible part and provided thereat with a cable-holder, a collar movable over the main arm part and attached to the rod, a cable-holder attached to the rod near the collar, a cable guided by the cable-holders, and a lamp attached to the cable.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY F. HOLTMANN.

Witnesses:

HARRY D. PIERsoN, E. T. SILvIUs.

IIO 

